urcu-defer: Add fast path for empty queues
authorMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Sun, 20 Sep 2009 15:39:30 +0000 (11:39 -0400)
committerMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Sun, 20 Sep 2009 15:39:30 +0000 (11:39 -0400)
defer_barrier does not need to call synchronize_rcu() when all queues are empty.
Skip the G.P. if this is the case.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>

No differences found
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